Numerical analysis of improvement effects on peaty ground by vertical drains/vacuum consolidation based on a new macro-element method

H. S. Nguyen, M. Tashiro, T. Noda, S. Yamada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Large deformation has been usually observed in peaty ground due to embankment loading. To increase stability and reduce residual settlement, ground improvement prior to the construction is very important. This study investigated numerically the ground improvement effects of vertical drain/vacuum consolidation on a peaty ground possessing a risk of slip failure under the non-improvement condition. A new macro-element method considering unknownwater pressure in drainswas incorporated in a soil-water coupled finite deformation analysis code GEOASIA. Analysis results showed that the ground improvement by PVDs is effective to prevent a failure during loading. Additionally, it was revealed that the PVDs installation with a sufficiently small drain pitch could have almost the same effect as the combination with vacuum consolidation to reduce the residual settlement after the construction. Vacuum consolidation is the most effective method to reduce the surrounding upheaval and lateral displacement due to the inward deformation by vacuum pressure.

Original languageEnglish
Title of host publicationComputer Methods and Recent Advances in Geomechanics - Proc. of the 14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
PublisherTaylor and Francis - Balkema
Pages1145-1150
Number of pages6
ISBN (Print)9781138001480
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 - Kyoto, Japan
Duration: 2014 Sep 222014 Sep 25

Publication series

NameComputer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014

Other

Other14th International Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014
CountryJapan
CityKyoto
Period14/9/2214/9/25

ASJC Scopus subject areas

  • Computer Science Applications
  • Geochemistry and Petrology

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